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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b48787b9bdecbe3fbcb77142588fddfde90d4778c6550202b7b2beff097378e6' 
  AND token = 'Tk5XiX/PsAVmBOkKen0RoadqzCqzNW8cMruSnZmNWs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}